package com.example.aiagent.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.aiagent.constant.UserConstant;
import com.example.aiagent.enums.UserRoleEnum;
import com.example.aiagent.exception.BusinessException;
import com.example.aiagent.exception.ErrorCode;
import com.example.aiagent.mapper.UserMapper;
import com.example.aiagent.model.dto.user.UserQueryRequest;
import com.example.aiagent.model.entity.User;
import com.example.aiagent.model.vo.LoginUserVO;
import com.example.aiagent.model.vo.UserVO;
import com.example.aiagent.service.UserService;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpSession;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
* @author wu
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-04-15 09:42:56
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService {
    /**
     * 用户注册
     * @param userAccount   用户账户
     * @param userPassword  用户密码
     * @param checkPassword 校验密码
     * @return
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1. 校验
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        // 2. 检查是否重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        // 3. 加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 4. 插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if (!saveResult) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        return user.getId();
    }

    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1. 校验
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码错误");
        }
        //2. 加密
        String encryptPassword = getEncryptPassword(userPassword);
        //3. 查询该账号在数据库中是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userPassword", encryptPassword);
        queryWrapper.eq("userAccount", userAccount);
        User user = this.baseMapper.selectOne(queryWrapper);
        if (user == null) {
            //不存在，抛异常
            log.info("user login failed userAccount can ont match password");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        //存在，保持用户登录状态
        HttpSession session = request.getSession();
        session.setAttribute(UserConstant.USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }


    /**
     * 获取加密后的密码
     * @param userPassword
     * @return
     */
    @Override
    public String getEncryptPassword(String userPassword) {
        // 盐值，混淆密码
        final String SALT = "code";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute(UserConstant.USER_LOGIN_STATE);
        //判断是否为空
        if (user == null || user.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //从数据库中查询
        Long userId = user.getId();
        User currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 获得脱敏后的视图信息
     * @param user
     * @return
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    /**
     * 获得脱敏后的用户视图信息
     * @param user
     * @return
     */
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获得脱敏后的用户视图信息列表
     * @param userList
     * @return
     */
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
    }

    /**
     * 退出登录
     * @param request
     * @return
     */
    @Override
    public boolean userLoginout(HttpServletRequest request) {
        //判断是否登录
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute(UserConstant.USER_LOGIN_STATE);
        if (user == null || user.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR, "未登录");
        }
        //移除登录状态
        session.removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userName = userQueryRequest.getUserName();
        String userAccount = userQueryRequest.getUserAccount();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> QueryWrapper = new QueryWrapper<>();
        QueryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        QueryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        QueryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        QueryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        QueryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        QueryWrapper.orderBy(StrUtil.isNotBlank(sortField), sortOrder.equals("ascend"), sortField);
        return QueryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        if (user == null) {
            return false;
        }
        return UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

}




